// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* H.323 extension for NAT alteration.
|
*
|
* Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
|
* Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net>
|
*
|
* Based on the 'brute force' H.323 NAT module by
|
* Jozsef Kadlecsik <kadlec@netfilter.org>
|
*/
|
|
#include <linux/module.h>
|
#include <linux/tcp.h>
|
#include <net/tcp.h>
|
|
#include <net/netfilter/nf_nat.h>
|
#include <net/netfilter/nf_nat_helper.h>
|
#include <net/netfilter/nf_conntrack_helper.h>
|
#include <net/netfilter/nf_conntrack_expect.h>
|
#include <linux/netfilter/nf_conntrack_h323.h>
|
|
/****************************************************************************/
|
static int set_addr(struct sk_buff *skb, unsigned int protoff,
|
unsigned char **data, int dataoff,
|
unsigned int addroff, __be32 ip, __be16 port)
|
{
|
enum ip_conntrack_info ctinfo;
|
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
|
struct {
|
__be32 ip;
|
__be16 port;
|
} __attribute__ ((__packed__)) buf;
|
const struct tcphdr *th;
|
struct tcphdr _tcph;
|
|
buf.ip = ip;
|
buf.port = port;
|
addroff += dataoff;
|
|
if (ip_hdr(skb)->protocol == IPPROTO_TCP) {
|
if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
|
protoff, addroff, sizeof(buf),
|
(char *) &buf, sizeof(buf))) {
|
net_notice_ratelimited("nf_nat_h323: nf_nat_mangle_tcp_packet error\n");
|
return -1;
|
}
|
|
/* Relocate data pointer */
|
th = skb_header_pointer(skb, ip_hdrlen(skb),
|
sizeof(_tcph), &_tcph);
|
if (th == NULL)
|
return -1;
|
*data = skb->data + ip_hdrlen(skb) + th->doff * 4 + dataoff;
|
} else {
|
if (!nf_nat_mangle_udp_packet(skb, ct, ctinfo,
|
protoff, addroff, sizeof(buf),
|
(char *) &buf, sizeof(buf))) {
|
net_notice_ratelimited("nf_nat_h323: nf_nat_mangle_udp_packet error\n");
|
return -1;
|
}
|
/* nf_nat_mangle_udp_packet uses skb_ensure_writable() to copy
|
* or pull everything in a linear buffer, so we can safely
|
* use the skb pointers now */
|
*data = skb->data + ip_hdrlen(skb) + sizeof(struct udphdr);
|
}
|
|
return 0;
|
}
|
|
/****************************************************************************/
|
static int set_h225_addr(struct sk_buff *skb, unsigned int protoff,
|
unsigned char **data, int dataoff,
|
TransportAddress *taddr,
|
union nf_inet_addr *addr, __be16 port)
|
{
|
return set_addr(skb, protoff, data, dataoff, taddr->ipAddress.ip,
|
addr->ip, port);
|
}
|
|
/****************************************************************************/
|
static int set_h245_addr(struct sk_buff *skb, unsigned protoff,
|
unsigned char **data, int dataoff,
|
H245_TransportAddress *taddr,
|
union nf_inet_addr *addr, __be16 port)
|
{
|
return set_addr(skb, protoff, data, dataoff,
|
taddr->unicastAddress.iPAddress.network,
|
addr->ip, port);
|
}
|
|
/****************************************************************************/
|
static int set_sig_addr(struct sk_buff *skb, struct nf_conn *ct,
|
enum ip_conntrack_info ctinfo,
|
unsigned int protoff, unsigned char **data,
|
TransportAddress *taddr, int count)
|
{
|
const struct nf_ct_h323_master *info = nfct_help_data(ct);
|
int dir = CTINFO2DIR(ctinfo);
|
int i;
|
__be16 port;
|
union nf_inet_addr addr;
|
|
for (i = 0; i < count; i++) {
|
if (get_h225_addr(ct, *data, &taddr[i], &addr, &port)) {
|
if (addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
|
port == info->sig_port[dir]) {
|
/* GW->GK */
|
|
/* Fix for Gnomemeeting */
|
if (i > 0 &&
|
get_h225_addr(ct, *data, &taddr[0],
|
&addr, &port) &&
|
(ntohl(addr.ip) & 0xff000000) == 0x7f000000)
|
i = 0;
|
|
pr_debug("nf_nat_ras: set signal address %pI4:%hu->%pI4:%hu\n",
|
&addr.ip, port,
|
&ct->tuplehash[!dir].tuple.dst.u3.ip,
|
info->sig_port[!dir]);
|
return set_h225_addr(skb, protoff, data, 0,
|
&taddr[i],
|
&ct->tuplehash[!dir].
|
tuple.dst.u3,
|
info->sig_port[!dir]);
|
} else if (addr.ip == ct->tuplehash[dir].tuple.dst.u3.ip &&
|
port == info->sig_port[dir]) {
|
/* GK->GW */
|
pr_debug("nf_nat_ras: set signal address %pI4:%hu->%pI4:%hu\n",
|
&addr.ip, port,
|
&ct->tuplehash[!dir].tuple.src.u3.ip,
|
info->sig_port[!dir]);
|
return set_h225_addr(skb, protoff, data, 0,
|
&taddr[i],
|
&ct->tuplehash[!dir].
|
tuple.src.u3,
|
info->sig_port[!dir]);
|
}
|
}
|
}
|
|
return 0;
|
}
|
|
/****************************************************************************/
|
static int set_ras_addr(struct sk_buff *skb, struct nf_conn *ct,
|
enum ip_conntrack_info ctinfo,
|
unsigned int protoff, unsigned char **data,
|
TransportAddress *taddr, int count)
|
{
|
int dir = CTINFO2DIR(ctinfo);
|
int i;
|
__be16 port;
|
union nf_inet_addr addr;
|
|
for (i = 0; i < count; i++) {
|
if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
|
addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
|
port == ct->tuplehash[dir].tuple.src.u.udp.port) {
|
pr_debug("nf_nat_ras: set rasAddress %pI4:%hu->%pI4:%hu\n",
|
&addr.ip, ntohs(port),
|
&ct->tuplehash[!dir].tuple.dst.u3.ip,
|
ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.port));
|
return set_h225_addr(skb, protoff, data, 0, &taddr[i],
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
ct->tuplehash[!dir].tuple.
|
dst.u.udp.port);
|
}
|
}
|
|
return 0;
|
}
|
|
/****************************************************************************/
|
static int nat_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
|
enum ip_conntrack_info ctinfo,
|
unsigned int protoff, unsigned char **data, int dataoff,
|
H245_TransportAddress *taddr,
|
__be16 port, __be16 rtp_port,
|
struct nf_conntrack_expect *rtp_exp,
|
struct nf_conntrack_expect *rtcp_exp)
|
{
|
struct nf_ct_h323_master *info = nfct_help_data(ct);
|
int dir = CTINFO2DIR(ctinfo);
|
int i;
|
u_int16_t nated_port;
|
|
/* Set expectations for NAT */
|
rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port;
|
rtp_exp->expectfn = nf_nat_follow_master;
|
rtp_exp->dir = !dir;
|
rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port;
|
rtcp_exp->expectfn = nf_nat_follow_master;
|
rtcp_exp->dir = !dir;
|
|
/* Lookup existing expects */
|
for (i = 0; i < H323_RTP_CHANNEL_MAX; i++) {
|
if (info->rtp_port[i][dir] == rtp_port) {
|
/* Expected */
|
|
/* Use allocated ports first. This will refresh
|
* the expects */
|
rtp_exp->tuple.dst.u.udp.port = info->rtp_port[i][dir];
|
rtcp_exp->tuple.dst.u.udp.port =
|
htons(ntohs(info->rtp_port[i][dir]) + 1);
|
break;
|
} else if (info->rtp_port[i][dir] == 0) {
|
/* Not expected */
|
break;
|
}
|
}
|
|
/* Run out of expectations */
|
if (i >= H323_RTP_CHANNEL_MAX) {
|
net_notice_ratelimited("nf_nat_h323: out of expectations\n");
|
return 0;
|
}
|
|
/* Try to get a pair of ports. */
|
for (nated_port = ntohs(rtp_exp->tuple.dst.u.udp.port);
|
nated_port != 0; nated_port += 2) {
|
int ret;
|
|
rtp_exp->tuple.dst.u.udp.port = htons(nated_port);
|
ret = nf_ct_expect_related(rtp_exp, 0);
|
if (ret == 0) {
|
rtcp_exp->tuple.dst.u.udp.port =
|
htons(nated_port + 1);
|
ret = nf_ct_expect_related(rtcp_exp, 0);
|
if (ret == 0)
|
break;
|
else if (ret == -EBUSY) {
|
nf_ct_unexpect_related(rtp_exp);
|
continue;
|
} else if (ret < 0) {
|
nf_ct_unexpect_related(rtp_exp);
|
nated_port = 0;
|
break;
|
}
|
} else if (ret != -EBUSY) {
|
nated_port = 0;
|
break;
|
}
|
}
|
|
if (nated_port == 0) { /* No port available */
|
net_notice_ratelimited("nf_nat_h323: out of RTP ports\n");
|
return 0;
|
}
|
|
/* Modify signal */
|
if (set_h245_addr(skb, protoff, data, dataoff, taddr,
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
htons((port & htons(1)) ? nated_port + 1 :
|
nated_port))) {
|
nf_ct_unexpect_related(rtp_exp);
|
nf_ct_unexpect_related(rtcp_exp);
|
return -1;
|
}
|
|
/* Save ports */
|
info->rtp_port[i][dir] = rtp_port;
|
info->rtp_port[i][!dir] = htons(nated_port);
|
|
/* Success */
|
pr_debug("nf_nat_h323: expect RTP %pI4:%hu->%pI4:%hu\n",
|
&rtp_exp->tuple.src.u3.ip,
|
ntohs(rtp_exp->tuple.src.u.udp.port),
|
&rtp_exp->tuple.dst.u3.ip,
|
ntohs(rtp_exp->tuple.dst.u.udp.port));
|
pr_debug("nf_nat_h323: expect RTCP %pI4:%hu->%pI4:%hu\n",
|
&rtcp_exp->tuple.src.u3.ip,
|
ntohs(rtcp_exp->tuple.src.u.udp.port),
|
&rtcp_exp->tuple.dst.u3.ip,
|
ntohs(rtcp_exp->tuple.dst.u.udp.port));
|
|
return 0;
|
}
|
|
/****************************************************************************/
|
static int nat_t120(struct sk_buff *skb, struct nf_conn *ct,
|
enum ip_conntrack_info ctinfo,
|
unsigned int protoff, unsigned char **data, int dataoff,
|
H245_TransportAddress *taddr, __be16 port,
|
struct nf_conntrack_expect *exp)
|
{
|
int dir = CTINFO2DIR(ctinfo);
|
u_int16_t nated_port = ntohs(port);
|
|
/* Set expectations for NAT */
|
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
|
exp->expectfn = nf_nat_follow_master;
|
exp->dir = !dir;
|
|
/* Try to get same port: if not, try to change it. */
|
for (; nated_port != 0; nated_port++) {
|
int ret;
|
|
exp->tuple.dst.u.tcp.port = htons(nated_port);
|
ret = nf_ct_expect_related(exp, 0);
|
if (ret == 0)
|
break;
|
else if (ret != -EBUSY) {
|
nated_port = 0;
|
break;
|
}
|
}
|
|
if (nated_port == 0) { /* No port available */
|
net_notice_ratelimited("nf_nat_h323: out of TCP ports\n");
|
return 0;
|
}
|
|
/* Modify signal */
|
if (set_h245_addr(skb, protoff, data, dataoff, taddr,
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
htons(nated_port)) < 0) {
|
nf_ct_unexpect_related(exp);
|
return -1;
|
}
|
|
pr_debug("nf_nat_h323: expect T.120 %pI4:%hu->%pI4:%hu\n",
|
&exp->tuple.src.u3.ip,
|
ntohs(exp->tuple.src.u.tcp.port),
|
&exp->tuple.dst.u3.ip,
|
ntohs(exp->tuple.dst.u.tcp.port));
|
|
return 0;
|
}
|
|
/****************************************************************************/
|
static int nat_h245(struct sk_buff *skb, struct nf_conn *ct,
|
enum ip_conntrack_info ctinfo,
|
unsigned int protoff, unsigned char **data, int dataoff,
|
TransportAddress *taddr, __be16 port,
|
struct nf_conntrack_expect *exp)
|
{
|
struct nf_ct_h323_master *info = nfct_help_data(ct);
|
int dir = CTINFO2DIR(ctinfo);
|
u_int16_t nated_port = ntohs(port);
|
|
/* Set expectations for NAT */
|
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
|
exp->expectfn = nf_nat_follow_master;
|
exp->dir = !dir;
|
|
/* Check existing expects */
|
if (info->sig_port[dir] == port)
|
nated_port = ntohs(info->sig_port[!dir]);
|
|
/* Try to get same port: if not, try to change it. */
|
for (; nated_port != 0; nated_port++) {
|
int ret;
|
|
exp->tuple.dst.u.tcp.port = htons(nated_port);
|
ret = nf_ct_expect_related(exp, 0);
|
if (ret == 0)
|
break;
|
else if (ret != -EBUSY) {
|
nated_port = 0;
|
break;
|
}
|
}
|
|
if (nated_port == 0) { /* No port available */
|
net_notice_ratelimited("nf_nat_q931: out of TCP ports\n");
|
return 0;
|
}
|
|
/* Modify signal */
|
if (set_h225_addr(skb, protoff, data, dataoff, taddr,
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
htons(nated_port))) {
|
nf_ct_unexpect_related(exp);
|
return -1;
|
}
|
|
/* Save ports */
|
info->sig_port[dir] = port;
|
info->sig_port[!dir] = htons(nated_port);
|
|
pr_debug("nf_nat_q931: expect H.245 %pI4:%hu->%pI4:%hu\n",
|
&exp->tuple.src.u3.ip,
|
ntohs(exp->tuple.src.u.tcp.port),
|
&exp->tuple.dst.u3.ip,
|
ntohs(exp->tuple.dst.u.tcp.port));
|
|
return 0;
|
}
|
|
/****************************************************************************
|
* This conntrack expect function replaces nf_conntrack_q931_expect()
|
* which was set by nf_conntrack_h323.c.
|
****************************************************************************/
|
static void ip_nat_q931_expect(struct nf_conn *new,
|
struct nf_conntrack_expect *this)
|
{
|
struct nf_nat_range2 range;
|
|
if (this->tuple.src.u3.ip != 0) { /* Only accept calls from GK */
|
nf_nat_follow_master(new, this);
|
return;
|
}
|
|
/* This must be a fresh one. */
|
BUG_ON(new->status & IPS_NAT_DONE_MASK);
|
|
/* Change src to where master sends to */
|
range.flags = NF_NAT_RANGE_MAP_IPS;
|
range.min_addr = range.max_addr =
|
new->tuplehash[!this->dir].tuple.src.u3;
|
nf_nat_setup_info(new, &range, NF_NAT_MANIP_SRC);
|
|
/* For DST manip, map port here to where it's expected. */
|
range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
|
range.min_proto = range.max_proto = this->saved_proto;
|
range.min_addr = range.max_addr =
|
new->master->tuplehash[!this->dir].tuple.src.u3;
|
nf_nat_setup_info(new, &range, NF_NAT_MANIP_DST);
|
}
|
|
/****************************************************************************/
|
static int nat_q931(struct sk_buff *skb, struct nf_conn *ct,
|
enum ip_conntrack_info ctinfo,
|
unsigned int protoff, unsigned char **data,
|
TransportAddress *taddr, int idx,
|
__be16 port, struct nf_conntrack_expect *exp)
|
{
|
struct nf_ct_h323_master *info = nfct_help_data(ct);
|
int dir = CTINFO2DIR(ctinfo);
|
u_int16_t nated_port = ntohs(port);
|
union nf_inet_addr addr;
|
|
/* Set expectations for NAT */
|
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
|
exp->expectfn = ip_nat_q931_expect;
|
exp->dir = !dir;
|
|
/* Check existing expects */
|
if (info->sig_port[dir] == port)
|
nated_port = ntohs(info->sig_port[!dir]);
|
|
/* Try to get same port: if not, try to change it. */
|
for (; nated_port != 0; nated_port++) {
|
int ret;
|
|
exp->tuple.dst.u.tcp.port = htons(nated_port);
|
ret = nf_ct_expect_related(exp, 0);
|
if (ret == 0)
|
break;
|
else if (ret != -EBUSY) {
|
nated_port = 0;
|
break;
|
}
|
}
|
|
if (nated_port == 0) { /* No port available */
|
net_notice_ratelimited("nf_nat_ras: out of TCP ports\n");
|
return 0;
|
}
|
|
/* Modify signal */
|
if (set_h225_addr(skb, protoff, data, 0, &taddr[idx],
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
htons(nated_port))) {
|
nf_ct_unexpect_related(exp);
|
return -1;
|
}
|
|
/* Save ports */
|
info->sig_port[dir] = port;
|
info->sig_port[!dir] = htons(nated_port);
|
|
/* Fix for Gnomemeeting */
|
if (idx > 0 &&
|
get_h225_addr(ct, *data, &taddr[0], &addr, &port) &&
|
(ntohl(addr.ip) & 0xff000000) == 0x7f000000) {
|
if (set_h225_addr(skb, protoff, data, 0, &taddr[0],
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
info->sig_port[!dir])) {
|
nf_ct_unexpect_related(exp);
|
return -1;
|
}
|
}
|
|
/* Success */
|
pr_debug("nf_nat_ras: expect Q.931 %pI4:%hu->%pI4:%hu\n",
|
&exp->tuple.src.u3.ip,
|
ntohs(exp->tuple.src.u.tcp.port),
|
&exp->tuple.dst.u3.ip,
|
ntohs(exp->tuple.dst.u.tcp.port));
|
|
return 0;
|
}
|
|
/****************************************************************************/
|
static void ip_nat_callforwarding_expect(struct nf_conn *new,
|
struct nf_conntrack_expect *this)
|
{
|
struct nf_nat_range2 range;
|
|
/* This must be a fresh one. */
|
BUG_ON(new->status & IPS_NAT_DONE_MASK);
|
|
/* Change src to where master sends to */
|
range.flags = NF_NAT_RANGE_MAP_IPS;
|
range.min_addr = range.max_addr =
|
new->tuplehash[!this->dir].tuple.src.u3;
|
nf_nat_setup_info(new, &range, NF_NAT_MANIP_SRC);
|
|
/* For DST manip, map port here to where it's expected. */
|
range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
|
range.min_proto = range.max_proto = this->saved_proto;
|
range.min_addr = range.max_addr = this->saved_addr;
|
nf_nat_setup_info(new, &range, NF_NAT_MANIP_DST);
|
}
|
|
/****************************************************************************/
|
static int nat_callforwarding(struct sk_buff *skb, struct nf_conn *ct,
|
enum ip_conntrack_info ctinfo,
|
unsigned int protoff,
|
unsigned char **data, int dataoff,
|
TransportAddress *taddr, __be16 port,
|
struct nf_conntrack_expect *exp)
|
{
|
int dir = CTINFO2DIR(ctinfo);
|
u_int16_t nated_port;
|
|
/* Set expectations for NAT */
|
exp->saved_addr = exp->tuple.dst.u3;
|
exp->tuple.dst.u3.ip = ct->tuplehash[!dir].tuple.dst.u3.ip;
|
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
|
exp->expectfn = ip_nat_callforwarding_expect;
|
exp->dir = !dir;
|
|
/* Try to get same port: if not, try to change it. */
|
for (nated_port = ntohs(port); nated_port != 0; nated_port++) {
|
int ret;
|
|
exp->tuple.dst.u.tcp.port = htons(nated_port);
|
ret = nf_ct_expect_related(exp, 0);
|
if (ret == 0)
|
break;
|
else if (ret != -EBUSY) {
|
nated_port = 0;
|
break;
|
}
|
}
|
|
if (nated_port == 0) { /* No port available */
|
net_notice_ratelimited("nf_nat_q931: out of TCP ports\n");
|
return 0;
|
}
|
|
/* Modify signal */
|
if (set_h225_addr(skb, protoff, data, dataoff, taddr,
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
htons(nated_port))) {
|
nf_ct_unexpect_related(exp);
|
return -1;
|
}
|
|
/* Success */
|
pr_debug("nf_nat_q931: expect Call Forwarding %pI4:%hu->%pI4:%hu\n",
|
&exp->tuple.src.u3.ip,
|
ntohs(exp->tuple.src.u.tcp.port),
|
&exp->tuple.dst.u3.ip,
|
ntohs(exp->tuple.dst.u.tcp.port));
|
|
return 0;
|
}
|
|
static struct nf_ct_helper_expectfn q931_nat = {
|
.name = "Q.931",
|
.expectfn = ip_nat_q931_expect,
|
};
|
|
static struct nf_ct_helper_expectfn callforwarding_nat = {
|
.name = "callforwarding",
|
.expectfn = ip_nat_callforwarding_expect,
|
};
|
|
/****************************************************************************/
|
static int __init init(void)
|
{
|
BUG_ON(set_h245_addr_hook != NULL);
|
BUG_ON(set_h225_addr_hook != NULL);
|
BUG_ON(set_sig_addr_hook != NULL);
|
BUG_ON(set_ras_addr_hook != NULL);
|
BUG_ON(nat_rtp_rtcp_hook != NULL);
|
BUG_ON(nat_t120_hook != NULL);
|
BUG_ON(nat_h245_hook != NULL);
|
BUG_ON(nat_callforwarding_hook != NULL);
|
BUG_ON(nat_q931_hook != NULL);
|
|
RCU_INIT_POINTER(set_h245_addr_hook, set_h245_addr);
|
RCU_INIT_POINTER(set_h225_addr_hook, set_h225_addr);
|
RCU_INIT_POINTER(set_sig_addr_hook, set_sig_addr);
|
RCU_INIT_POINTER(set_ras_addr_hook, set_ras_addr);
|
RCU_INIT_POINTER(nat_rtp_rtcp_hook, nat_rtp_rtcp);
|
RCU_INIT_POINTER(nat_t120_hook, nat_t120);
|
RCU_INIT_POINTER(nat_h245_hook, nat_h245);
|
RCU_INIT_POINTER(nat_callforwarding_hook, nat_callforwarding);
|
RCU_INIT_POINTER(nat_q931_hook, nat_q931);
|
nf_ct_helper_expectfn_register(&q931_nat);
|
nf_ct_helper_expectfn_register(&callforwarding_nat);
|
return 0;
|
}
|
|
/****************************************************************************/
|
static void __exit fini(void)
|
{
|
RCU_INIT_POINTER(set_h245_addr_hook, NULL);
|
RCU_INIT_POINTER(set_h225_addr_hook, NULL);
|
RCU_INIT_POINTER(set_sig_addr_hook, NULL);
|
RCU_INIT_POINTER(set_ras_addr_hook, NULL);
|
RCU_INIT_POINTER(nat_rtp_rtcp_hook, NULL);
|
RCU_INIT_POINTER(nat_t120_hook, NULL);
|
RCU_INIT_POINTER(nat_h245_hook, NULL);
|
RCU_INIT_POINTER(nat_callforwarding_hook, NULL);
|
RCU_INIT_POINTER(nat_q931_hook, NULL);
|
nf_ct_helper_expectfn_unregister(&q931_nat);
|
nf_ct_helper_expectfn_unregister(&callforwarding_nat);
|
synchronize_rcu();
|
}
|
|
/****************************************************************************/
|
module_init(init);
|
module_exit(fini);
|
|
MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
|
MODULE_DESCRIPTION("H.323 NAT helper");
|
MODULE_LICENSE("GPL");
|
MODULE_ALIAS_NF_NAT_HELPER("h323");
|
